You get bed bugs by bringing them home yourself, almost always without realizing it. Bed bugs don’t live outdoors, don’t jump onto you from grass or trees, and don’t spread through dirt or poor hygiene. They move from place to place by hiding in luggage, clothing, furniture, and other personal belongings, hitching a ride as you go about your life. Understanding the specific ways this happens can help you avoid an infestation.
Bed Bugs Are Hitchhikers, Not Jumpers
Bed bugs are small, flat, wingless insects. They cannot fly or jump. What they can do is crawl quickly and squeeze into remarkably tight spaces, which makes them excellent stowaways. They hide in seams, cracks, folds, and crevices of nearly anything you carry or move: suitcases, backpacks, purses, shoes (even the waffle-patterned soles of sneakers), books, laptops, and clothing. They travel on trains, planes, buses, and in cars.
Because they’re roughly the size of an apple seed when fully grown, and even smaller as juveniles, they’re easy to miss. A single pregnant female tucked into a luggage seam is enough to start an infestation. Once she has access to a blood meal (you, while you sleep), she can lay one to seven eggs per day for about 10 days after feeding. A new bed bug goes from egg to reproducing adult in roughly 37 days, so populations grow fast.
Where People Pick Them Up
Hotels and short-term rentals are the most commonly cited sources, but bed bugs turn up in any place where people sit, sleep, or store belongings in close proximity. That includes dormitories, hospitals, movie theaters, office buildings, public transit, and shelters. Anywhere a bed bug can crawl off one person’s bag and onto another’s is a potential transfer point.
Multi-unit housing carries a specific risk. Research from Purdue University confirmed that bed bugs leave infested apartments through the gap around the entry door, crawl into the hallway, and enter neighboring units. In a study of five infested apartments, three out of five hallway traps caught bed bugs within a single week. If your neighbor has an infestation, the bugs can reach you through hallways, shared wall voids, and gaps around electrical outlets or plumbing, even if you’ve never visited that unit.
Used Furniture and Thrift Shopping
Secondhand goods are one of the most common ways bed bugs enter a home. Sofas and upholstered chairs are the second most likely place to find bed bugs after beds, because they offer the same combination of fabric seams, cushion crevices, and proximity to a sleeping or resting human. Dressers, nightstands, headboards, and bed frames can also harbor them in cracks and joints.
If you’re buying used furniture, inspect it carefully before bringing it inside. Remove cushions and check along decorative seams and piping. Push down on sofa springs and look inside the frame. Flip the piece over and examine the underside. For wood furniture like nightstands or dressers, open every drawer, look in corners and along tracks, and wipe surfaces with a light-colored cloth to pick up any dark smudges. Metal bed frames are less attractive to bed bugs than wood, but still need inspection.
Used clothing, sheets, and towels carry risk too. Check pockets and seams, turn garments inside out, and shake out linens before purchasing. Washing and drying on high heat before storing anything in your home kills bed bugs at all life stages.
Your Pets Probably Aren’t the Source
Bed bugs feed primarily on humans, and infestations are always tied to human habitation. While bed bugs will bite dogs and cats in an already-infested home, pets are not considered a meaningful route for introducing bed bugs. The Companion Animal Parasite Council states plainly that pets are not involved in bed bug infestations and do not serve as a source. It’s theoretically possible for a bug to ride in on a pet or in pet bedding, but it’s unlikely enough that it shouldn’t be your focus.
Why They’re So Hard to Get Rid Of
Several biological traits make bed bugs persistent once they arrive. They can survive without a blood meal for 20 to 400 days, depending on temperature and humidity. Adults in cool conditions have survived over 400 days without feeding in laboratory settings. That means leaving a room empty for a few weeks, or even a few months, won’t reliably starve them out.
Many modern bed bug populations have also developed resistance to the most common household insecticides, the same class of chemicals found in most over-the-counter sprays. When exposed to these products, resistant bugs may simply relocate to a new hiding spot rather than die. Professional treatments increasingly rely on other approaches: desiccant dusts that physically damage the bug’s outer shell (something they can’t develop resistance to), heat treatments that raise room temperatures above lethal thresholds, and newer chemical classes that work through different biological pathways.
How to Spot Them Early
Catching an infestation quickly makes treatment far easier. The signs are specific and recognizable once you know what to look for.
- Fecal spots: Small black dots, often in clusters of 10 or more, found on mattress seams, sheets, headboards, and wood surfaces. They’re black rather than red because the blood has already been digested, and they feel smooth to the touch because they’re dried liquid.
- Molted skins: Translucent, empty shells that look like a hollow version of the bug itself. You’ll find them in various sizes because bed bugs shed their skin five times before reaching adulthood.
- Eggs: Pearl-white, about the size of a pinhead. After five days, you can see tiny dark eyespots on them.
- Live bugs: Flat and oval before feeding, swollen and reddish-brown after. They cluster together in hiding spots, creating dirty-looking patches of shed skins, eggs, and droppings.
Check mattress seams, the junction between the headboard and wall, inside box springs, and along the edges of upholstered furniture. Use a flashlight and look in any crack or crevice within about eight feet of where someone sleeps. If you’re staying in a hotel, inspect the bed and luggage rack before unpacking, and keep your suitcase off the floor and away from the bed. When you get home, unpack directly into a washing machine or into a bathtub where you can inspect everything on a clean, light-colored surface before it enters your living space.